[英]How to make a consistent WIFI connection in android
In my new android app, I have made a direct tcp connection to a device with specific IP and port, all working fine. 在我的新android应用中,我已直接通过TCP连接到具有特定IP和端口的设备,并且一切正常。 Issue here is when Wifi disconnect it does not reconnect or send data again.
这里的问题是,当Wifi断开连接时,它不会重新连接或再次发送数据。
Inside my code below, I have a class Client.java
and MainActivity.java
below. 在下面的代码中,下面有一个类
Client.java
和MainActivity.java
。
How can I do this? 我怎样才能做到这一点?
#####################################################
public class Client extends AsyncTask<String, Void, Void> {
String dstAddress;
int dstPort;
String response = "";
TextView textResponse;
Socket socket = null; Socket smtpSocket = null;
DataOutputStream os = null;
DataInputStream is = null;
Client(String addr, int port, TextView textResponse) {
dstAddress = addr;
dstPort = port;
this.textResponse = textResponse;
}
@Override
protected Void doInBackground(String... params) {
String str = params[0];
try {
smtpSocket = new Socket(dstAddress, dstPort);
os = new DataOutputStream(smtpSocket.getOutputStream());
is = new DataInputStream(smtpSocket.getInputStream());
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(
1024);
byte[] buffer = new byte[1024];
int bytesRead;
InputStream inputStream = smtpSocket.getInputStream();
//smtpSocket.
/* notice: inputStream.read() will block if no data return */
while ((bytesRead = inputStream.read(buffer)) != -1) {
byteArrayOutputStream.write(buffer, 0, bytesRead);
response += byteArrayOutputStream.toString("UTF-8");
}
//textResponse.setText(response);
} catch (UnknownHostException e) {
System.err.println("Don't know about host: hostname");
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: hostname");
}
if (smtpSocket != null && os != null ) {
try {
os.writeBytes(str);
String responseLine;
while ((responseLine = is.readLine()) != null) {
System.out.println("Server: " + responseLine);
if (responseLine.indexOf("Ok") != -1) {
break;
}
}
//os.close();
//is.close();
//smtpSocket.close();
} catch (UnknownHostException e) {
System.err.println("Trying to connect to unknown host: " + e);
} catch (IOException e) {
System.err.println("IO-Exception: " + e);
}
}
return null;
}
@Override
protected void onPostExecute(Void result) {
//textResponse.setText("dweewed");
super.onPostExecute(result);
//super.cancel(true);
}
public void sendToPort(String str) throws IOException {
if (smtpSocket != null && os != null ) {
try {
os.writeBytes(str);
// os.close();
// is.close();
// smtpSocket.close();
} catch (UnknownHostException e) {
System.err.println("Trying to connect to unknown host: " + e);
} catch (IOException e) {
System.err.println("IOException: " + e);
}
}
}
}
#############################################################
MainActivity.java
public class MainActivity extends AppCompatActivity {
Button buttonConnect, buttonClear;
TextView response;
Client myClient;
String editTextAddress = "10.0.1.50";
Integer editTextPort = 48;
boolean keepalive = true;
ConnectivityManager connManager;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myClient = new Client(editTextAddress, editTextPort, response);
connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
buttonConnect = (Button) findViewById(R.id.btnconnect);
buttonClear = (Button) findViewById(R.id.clear);
response = (TextView) findViewById(R.id.feedback);
buttonConnect.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
response.setText("");
String dat = "Open";
try {
//String dat = "sec rfdgdf";
dat = dat + "\r\n";
myClient.sendToPort(dat);
} catch (UnknownHostException e) {
System.err.println("Trying to connect to unknown host: " + e);
response.setText("Trying to connect to unknown host: " + e);
} catch (IOException e) {
System.err.println("IOException: " + e);
}
}
});
}
@Override
public void onResume(){
super.onResume();
response.setText("Resum`enter code here`e connected!");
}
}
You can implement the reconnect logic in the callback of registerNetworkCallback in the ConnectivityManager 您可以在ConnectivityManager的registerNetworkCallback回调中实现重新连接逻辑
The code you provided doesn't use connManager
您提供的代码不使用
connManager
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